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<h2 id="Mac-OS-安装-flink"><a href="#Mac-OS-安装-flink" class="headerlink" title="Mac OS 安装 flink"></a>Mac OS 安装 flink</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">brew install apache-flink</span><br></pre></td></tr></table></figure>

<h2 id="启动-flink"><a href="#启动-flink" class="headerlink" title="启动 flink"></a>启动 flink</h2><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">/usr/<span class="built_in">local</span>/opt/apache-flink/libexec/bin/start-cluster.sh</span><br></pre></td></tr></table></figure>

<p>查看 flink 的 Web 界面 <a target="_blank" rel="noopener" href="http://localhost:8081/">http://localhost:8081/</a></p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/flink_quickstart_launch_flink.png" alt="flink_quickstart_launch_flink.png"></p>
<h2 id="新建一个-maven-工程"><a href="#新建一个-maven-工程" class="headerlink" title="新建一个 maven 工程"></a>新建一个 maven 工程</h2><h3 id="依赖"><a href="#依赖" class="headerlink" title="依赖"></a>依赖</h3><figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.apache.flink<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>flink-streaming-java_2.12<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.11.0<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h3 id="SocketTextStreamWordCount"><a href="#SocketTextStreamWordCount" class="headerlink" title="SocketTextStreamWordCount"></a>SocketTextStreamWordCount</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> org.fengxuechao.example.flink.quickstart;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.apache.flink.api.common.functions.FlatMapFunction;</span><br><span class="line"><span class="keyword">import</span> org.apache.flink.api.java.tuple.Tuple2;</span><br><span class="line"><span class="keyword">import</span> org.apache.flink.streaming.api.datastream.DataStreamSource;</span><br><span class="line"><span class="keyword">import</span> org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;</span><br><span class="line"><span class="keyword">import</span> org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;</span><br><span class="line"><span class="keyword">import</span> org.apache.flink.util.Collector;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.Arrays;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> fengxuechao</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@date</span> 2021/4/6</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">SocketTextStreamWordCount</span> </span>&#123;</span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> <span class="keyword">throws</span> Exception </span>&#123;</span><br><span class="line">        <span class="comment">//参数检查</span></span><br><span class="line">        <span class="keyword">if</span> (args.length != <span class="number">2</span>) &#123;</span><br><span class="line">            System.err.println(<span class="string">&quot;USAGE:\nSocketTextStreamWordCount &lt;hostname&gt; &lt;port&gt;&quot;</span>);</span><br><span class="line">            <span class="keyword">return</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        String hostname = args[<span class="number">0</span>];</span><br><span class="line">        Integer port = Integer.parseInt(args[<span class="number">1</span>]);</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">        <span class="comment">// set up the streaming execution environment</span></span><br><span class="line">        <span class="keyword">final</span> StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();</span><br><span class="line"></span><br><span class="line">        <span class="comment">//获取数据</span></span><br><span class="line">        DataStreamSource&lt;String&gt; stream = env.socketTextStream(hostname, port);</span><br><span class="line"></span><br><span class="line">        <span class="comment">//计数</span></span><br><span class="line">        SingleOutputStreamOperator&lt;Tuple2&lt;String, Integer&gt;&gt; sum = stream.map(value -&gt; &#123;</span><br><span class="line">            System.out.println(<span class="string">&quot;map:&quot;</span> + value);</span><br><span class="line">            <span class="keyword">return</span> value;</span><br><span class="line">        &#125;).flatMap(<span class="keyword">new</span> LineSplitter())</span><br><span class="line">                .keyBy(<span class="number">0</span>)</span><br><span class="line">                .sum(<span class="number">1</span>);</span><br><span class="line"></span><br><span class="line">        sum.print();</span><br><span class="line"></span><br><span class="line">        env.execute(<span class="string">&quot;Java WordCount from SocketTextStream Example&quot;</span>);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">LineSplitter</span> <span class="keyword">implements</span> <span class="title">FlatMapFunction</span>&lt;<span class="title">String</span>, <span class="title">Tuple2</span>&lt;<span class="title">String</span>, <span class="title">Integer</span>&gt;&gt; </span>&#123;</span><br><span class="line">        <span class="meta">@Override</span></span><br><span class="line">        <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">flatMap</span><span class="params">(String s, Collector&lt;Tuple2&lt;String, Integer&gt;&gt; collector)</span> </span>&#123;</span><br><span class="line">            System.out.println(<span class="string">&quot;LineSplitter.value:&quot;</span>+s);</span><br><span class="line">            String[] tokens = s.toLowerCase().split(<span class="string">&quot;\\W+&quot;</span>);</span><br><span class="line">            System.out.println(<span class="string">&quot;LineSplitter.value.splits:&quot;</span>+ Arrays.toString(tokens));</span><br><span class="line">            <span class="keyword">for</span> (String token : tokens) &#123;</span><br><span class="line">                <span class="keyword">if</span> (token.length() &gt; <span class="number">0</span>) &#123;</span><br><span class="line">                    collector.collect(<span class="keyword">new</span> Tuple2&lt;String, Integer&gt;(token, <span class="number">1</span>));</span><br><span class="line">                &#125;</span><br><span class="line">                System.out.println(<span class="string">&quot;LineSplitter.value.split:&quot;</span>+ token);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="运行"><a href="#运行" class="headerlink" title="运行"></a>运行</h2><h3 id="maven-项目打包"><a href="#maven-项目打包" class="headerlink" title="maven 项目打包"></a>maven 项目打包</h3><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mvn clean package</span><br></pre></td></tr></table></figure>

<h3 id="监听-9000-端口"><a href="#监听-9000-端口" class="headerlink" title="监听 9000 端口"></a>监听 9000 端口</h3><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">nc -l 9000</span><br></pre></td></tr></table></figure>

<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/flink_quickstart_nc.png" alt="img.png"></p>
<h3 id="使用-flink-运行程序"><a href="#使用-flink-运行程序" class="headerlink" title="使用 flink 运行程序"></a>使用 flink 运行程序</h3><figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">flink run -c org.fengxuechao.example.flink.quickstart.SocketTextStreamWordCount flink/quickstart/target/quickstart-1.0-SNAPSHOT.jar 127.0.0.1 9000</span><br></pre></td></tr></table></figure>

<h3 id="查看-flink-界面的日志"><a href="#查看-flink-界面的日志" class="headerlink" title="查看 flink 界面的日志"></a>查看 flink 界面的日志</h3><p><img src="https://gitee.com/littlefxc/oss/raw/master/images/flink_quickstart_webui_log.png" alt="img.png"></p>

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